x1, y1, x2, y2 = [float(x) for x in input().split(" ")]

print( ( (x2 - x1) ** 2  +  (y2 - y1) ** 2 ) ** (1/2) ) float(x) for x in input().split(" ") for x in input().split(" ") x input().split(" ") ().split () input split " " for x in input().split(" ") float(x) float x x1, y1, x2, y2 = [float(x) for x in input().split(" ")] x1 [float(x) for x in input().split(" ")] y1 x2 y2 print( ( (x2 - x1) ** 2  +  (y2 - y1) ** 2 ) ** (1/2) ) print ( (x2 - x1) ** 2  +  (y2 - y1) ** 2 ) ** (1/2) (x2 - x1) ** 2  +  (y2 - y1) ** 2 (x2 - x1) ** 2 x2 - x1 x2 x1 2 (y2 - y1) ** 2 y2 - y1 y2 y1 2 1/2 1 2 y1, x2, y2 = [float(x) for x in input().split(" ")] [float(x) for x in input().split(" ")] y1 y2 = [float(x) for x in input().split(" ")] [float(x) for x in input().split(" ")] y2 x1, y1, x2, y2 = [float(x) for x in input().split(" ")] [float(x) for x in input().split(" ")] x1 x2, y2 = [float(x) for x in input().split(" ")] [float(x) for x in input().split(" ")] x2
x1, y1, x2, y2 = [float(x) for x in input().split(" ")]

print( ( (x2 - x1) ** 2  +  (y2 - y1) ** 2 ) ** (1/2) )